Photosynthesis of deficit-irrigated plants grown for 62 days after planting in polyvinylchloride cylinders 15 cm in diameter and 45 cm deep filled with a 33:33:33 mix of sandy loam soil:washed sand:calcined clay within two greenhouses maintained at different CO2 concentrations eight days after a defoliaton event

23%

LeCain et al. (2003)

Photosynthesis of plants growing naturally in a semi-arid nitrogen-limited grassland of northeastern Colorado (USA) within open-top chambers for a period of four years